So far myself and a friend have had nothing but problems with our 77 Superclutches.
I've seen/heard people say that you should drill out the studs on the shoes and put in larger ones along with using larger hardware like M7 or M8. If you go the M7 route good luck finding the proper bolts and it seems to be that M8 would be too large without modifying the shoes and getting larger springs but I'm not sure.
What has everyone else had to do so far to make their 77 SC's work?
Is there anyone that has been able to run their SC completely stock without issues?